Sofa bed



FIG. 1 is a left side elevational view of sofa bed showing my new design; the right side being a mirror image;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view of sofa bed showing the sofa in a flattened position for use as a bed; and,

FIG. 6 is a perspective view of the sofa bed in the position shown in FIG. 1. 

The ornamental design for sofa bed, as shown and described. 